A bottom sealing structure of a coal mill of a power plant boiler

Abstract

The application discloses a bottom sealing structure of a coal mill of a power plant boiler and relates to the technical field of the coal mill of the power plant boiler. The bottom sealing structure of the coal mill of the power plant boiler comprises a positioning assembly, a shielding assembly, a sealing assembly and the like. Preferably, the positioning assembly comprises a positioning ring, the outer wall surface of the positioning ring is provided with a plurality of stepped holes near the bottom position, and a screw is arranged in the inner cavity of each stepped hole. Preferably, an annular groove is formed in the inner cavity of the positioning ring near the upper position of the middle part. The application can tightly fit the gap between the grinding disc and the bottom shell, thereby guaranteeing the sealing performance of the connection between the grinding disc and the bottom shell, preventing the leakage of stone coal from the connection between the grinding disc and the bottom shell, and thereby not affecting the operation of the coal mill.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mill of power plant boiler, in particular to a bottom sealing structure of coal mill of power plant boiler. BACKGROUND

[0002] The coal mill of power plant boiler is a device for grinding coal into fine powder for combustion in the boiler. The coal mill is an important component of thermal power plants and industrial boilers because it can improve the combustion efficiency of coal, reduce the emission of pollutants, and improve the thermal efficiency of the boiler. The main components of the coal mill include the mill stand, the bottom shell, the speed reducer, and the grinding disc. However, the bottom sealing structure of the coal mill of power plant boiler is a special sealing design aimed at preventing coal dust and coal dust from leaking into the surrounding environment and ensuring the stable operation of the boiler system.

[0003] However, the existing coal mill of power plant boiler has a large gap due to the long-term contact between the protective cover and the stone coal, which causes the stone coal to leak from the connection between the grinding disc and the bottom shell, thereby affecting the operation of the coal mill. Therefore, we propose a bottom sealing structure of coal mill of power plant boiler to solve the above problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a bottom sealing structure of coal mill of power plant boiler, which solves the problem of a large gap due to the long-term contact between the protective cover and the stone coal, which causes the stone coal to leak from the connection between the grinding disc and the bottom shell, thereby affecting the operation of the coal mill.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme: a bottom sealing structure of coal mill of power plant boiler, comprising:

[0006] a positioning assembly;

[0007] a shielding assembly arranged on the outer wall surface of the positioning assembly;

[0008] a sealing assembly arranged on the outer side of the positioning assembly, and the sealing assembly is connected with the shielding assembly through clamping.

[0009] Preferably, the positioning assembly comprises a positioning ring, a plurality of stepped holes are arranged on the outer wall surface of the positioning ring and close to the bottom position, and a screw is arranged in each stepped hole.

[0010] Preferably, an annular groove is arranged in the inner cavity of the positioning ring and close to the upper position, and a sealing rubber ring is arranged in the inner cavity of the annular groove.

[0011] Preferably, the shielding assembly comprises a fixed ring arranged in the middle of the outer wall surface of the positioning ring, a shielding cover arranged at the upper position of the middle of the outer wall surface of the fixed ring, and a first clamping ring arranged at one side of the middle of the top surface of the shielding cover.

[0012] Preferably, the sealing assembly comprises a bottom ring, a vertical ring arranged at the top surface of the bottom ring and close to the outer wall, and a sealing ring fixedly arranged at the top of the inner wall of the vertical ring and connected with the first clamping ring in the cavity.

[0013] Preferably, the sealing assembly further comprises a plurality of inclined struts, and the plurality of inclined struts are arranged in an annular array on the inner wall of the vertical ring and connected with the bottom surface of the sealing ring at the top end.

[0014] Preferably, the cavity of the shielding cover is fixedly provided with an insertion ring at the bottom surface, the top surface of the bottom ring is fixedly provided with a second clamping ring close to the inner wall, and the second clamping ring is connected with the insertion ring.

[0015] Beneficial effects

[0016] The present application provides a power plant boiler coal mill bottom sealing structure. Compared with the prior art, the following beneficial effects are achieved:

[0017] The power plant boiler coal mill bottom sealing structure can be installed on the grinding disc and fixedly installed on the shielding assembly through the positioning assembly, and can be fixed on the top surface of the bottom shell and connected with the shielding assembly through the sealing assembly. Therefore, when the positioning assembly rotates with the grinding disc, the shielding assembly will rotate with the positioning assembly, and the shielding assembly will rotate on the sealing assembly. Due to the close fit between the sealing assembly and the shielding assembly, the sealing property of the connection between the two is guaranteed, the leakage of stone coal from the connection between the two is prevented, and the operation of the coal mill is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the present application;

[0020] Figure 3 It is a schematic diagram of the explosion structure of the present application;

[0021] Figure 4 It is a schematic diagram of the positioning assembly structure of the present application;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the shielding assembly of the present application;

[0023] Figure 6 It is a schematic diagram of the structure of the local part A of the present application;

[0024] Figure 7 It is a schematic diagram of the structure of the sealing assembly of the present application;

[0025] Figure 8 It is a schematic diagram of the structure of the local part B of the present application.

[0026] In the figure: 1, positioning assembly; 11, positioning ring; 12, stepped hole; 13, screw; 14, annular groove; 15, sealing rubber ring; 2, shielding assembly; 21, fixing ring; 22, shielding cover; 23, insertion ring; 24, first clamping ring; 3, sealing assembly; 31, bottom ring; 32, second clamping ring; 33, vertical ring; 34, sealing ring; 35, inclined support rod. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] Please refer to Figures 1-8 The present application provides a technical solution: a sealing structure at the bottom of a coal mill of a boiler in a power plant, comprising: a positioning assembly 1; a shielding assembly 2, which is arranged on the middle part of the outer wall surface of the positioning assembly 1; and a sealing assembly 3, which is arranged on the outer side of the positioning assembly 1 and is connected with the shielding assembly 2 in a clamping manner.

[0029] Through the positioning assembly 1, it can be installed on the grinding disc and fixed with the shielding assembly 2. Then through the sealing assembly 3, it can be fixed on the top surface of the bottom shell and connected with the shielding assembly 2 in a clamping manner. Therefore, when the positioning assembly 1 rotates with the grinding disc, the positioning assembly 1 will drive the shielding assembly 2 to rotate, so that the shielding assembly 2 can rotate on the sealing assembly 3. Since the sealing assembly 3 and the shielding assembly 2 are tightly connected, the sealing property of the connection between them can be ensured, so that the leakage of stone coal from the connection between them can be prevented, and the operation of the coal mill is not affected.

[0030] Please refer to Figure 3 , Figure 4 The positioning assembly 1 comprises a positioning ring 11, a plurality of stepped holes 12 are arranged around the outer wall surface of the positioning ring 11 and close to the bottom position, a screw 13 is arranged in each stepped hole 12, an annular groove 14 is arranged in the middle upper position of the inner cavity of the positioning ring 11, and a sealing rubber ring 15 is arranged in the inner cavity of the annular groove 14.

[0031] By positioning the positioning ring 11 in the positioning assembly 1, it can be installed on the grinding disc, and the multiple stepped holes 12 and annular grooves 14 can be provided with opening space, and then by rotating the screw 13 located in the stepped hole 12, the positioning ring 11 can be stably fixed on the grinding disc, thereby improving the stability of the use of the positioning ring 11, and then by the sealing rubber ring 15 in the inner cavity of the annular groove 14, the sealing performance of the connection between the positioning ring 11 and the grinding disc can be improved, preventing the leakage of pulverized coal from the gap between the two.

[0032] Referring to Figure 3 , Figure 5 and Figure 6 , the shielding assembly 2 includes a fixed ring 21 arranged on the outer wall surface of the middle part of the positioning ring 11, and the upper part of the outer wall surface of the fixed ring 21 is provided with a shielding cover 22, and the top surface of the shielding cover 22 is provided with a first clamping ring 24 on one side of the middle part, and the first clamping ring 24 is connected with the sealing assembly 3 in a clamping manner, and the sealing assembly 3 includes a bottom ring 31, and the top surface of the bottom ring 31 is provided with a vertical ring 33 near the outer wall, and the inner wall of the vertical ring 33 is fixedly provided with a sealing ring 34 at the top, and the bottom end of the sealing ring 34 is connected with the inner cavity of the first clamping ring 24 in a clamping manner, and the sealing assembly 3 further includes a plurality of inclined supporting rods 35, and the plurality of inclined supporting rods 35 are arranged in an annular array on the inner wall of the vertical ring 33, and the top end of the inclined supporting rod 35 is connected with the bottom surface of the sealing ring 34, and the inner cavity of the shielding cover 22 is fixedly provided with an insertion ring 23 on the bottom surface, and the top surface of the bottom ring 31 is fixedly provided with a second clamping ring 32 near the inner wall, and the second clamping ring 32 is connected with the insertion ring 23 in a clamping manner;

[0033] By the fixed ring 21 in the shielding assembly 2, it can be fixed on the outer wall surface of the positioning ring 11, and the shielding cover 22 can be installed, and then by the bottom ring 31, it can be fixed on the top surface of the bottom shell, and the second clamping ring 32 and the vertical ring 33 can be installed, and since the top surface of the shielding cover 22 is provided with the first clamping ring 24 on one side of the middle part, and the inner wall of the vertical ring 33 is fixedly provided with the sealing ring 34 at the top, and the bottom end of the sealing ring 34 is connected with the inner cavity of the first clamping ring 24 in a clamping manner, by the clamping of the first clamping ring 24 and the sealing ring 34, the rotation of the grinding disc is not affected, and the leakage of stone coal from the connection between the two is prevented, and then since the inner cavity of the shielding cover 22 is fixedly provided with the insertion ring 23 on the bottom surface, and the top surface of the bottom ring 31 is fixedly provided with the second clamping ring 32 near the inner wall, and the second clamping ring 32 is connected with the insertion ring 23 in a clamping manner, the gap between the grinding disc and the bottom shell can be sealed again, and the rotation of the grinding disc is not affected, so that the operation of the coal mill is not affected, and the long-term use and stability of the equipment are improved, and by the plurality of inclined supporting rods 35, the insertion ring 23 can be supported, thereby reducing the deformation of the insertion ring 23, and thereby improving the service life of the insertion ring 23.

[0034] When working, through the positioning assembly 1, it can be installed on the grinding disc, and the shielding assembly 2 can be installed and fixed, and then through the sealing assembly 3, it can be fixed on the top surface of the bottom shell, and it can be connected with the shielding assembly 2, so when the positioning assembly 1 rotates with the grinding disc, the positioning assembly 1 will drive the shielding assembly 2 to rotate, and then the shielding assembly 2 can rotate on the sealing assembly 3, and because the sealing assembly 3 and the shielding assembly 2 are double tightly fitted, the sealing of the connection between the two can be ensured, and the leakage of stone coal from the connection between the two can be prevented, and the operation of the coal mill is not affected.

[0035] Through the positioning ring 11 in the positioning assembly 1, it can be installed on the grinding disc, and a plurality of stepped holes 12 and annular grooves 14 can be provided with opening space, and then through the screw 13 located in the stepped hole 12, the positioning ring 11 can be stably fixed on the grinding disc, and the stability of the use of the positioning ring 11 can be improved, and then through the sealing rubber ring 15 in the inner cavity of the annular groove 14, the sealing of the connection between the positioning ring 11 and the grinding disc can be improved, and the leakage of pulverized coal from the gap between the two can be prevented.

[0036] Through the fixed ring 21 in the shielding assembly 2, it can be fixed on the outer wall surface of the positioning ring 11, and the shielding cover 22 can be installed, and then through the bottom ring 31, it can be fixed on the top surface of the bottom shell, and the second clamping ring 32 and the stand ring 33 can be installed, because the first clamping ring 24 is arranged on one side of the middle part of the top surface of the shielding cover 22, and the sealing ring 34 is fixedly arranged on the inner wall top of the stand ring 33, and the sealing ring 34 is connected with the first clamping ring 24 in the cavity, so through the mutual clamping of the first clamping ring 24 and the sealing ring 34, the rotation of the grinding disc is not affected, and the leakage of stone coal from the connection between the two is prevented, and then because the insertion ring 23 is fixedly arranged on the inner cavity bottom surface of the shielding cover 22, and the second clamping ring 32 is fixedly arranged on the top surface of the bottom ring 31 and close to the inner wall position, and the second clamping ring 32 is connected with the insertion ring 23, the gap between the grinding disc and the bottom shell can be sealed again, and the rotation of the grinding disc is not affected, so that the operation of the coal mill is not affected, the long-term use and stability of the equipment are improved, and through a plurality of inclined struts 35, the insertion ring 23 can be supported, so that the deformation of the insertion ring 23 can be reduced, and the service life of the insertion ring 23 can be improved.

[0037] In summary, the device can double tightly fit the gap between the grinding disc and the bottom shell, and then the sealing of the connection between the two can be ensured, and the leakage of stone coal from the connection between the two can be prevented, and the operation of the coal mill is not affected.

[0038] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

Claims

1. A bottom sealing structure for a coal mill in a power plant boiler, characterized in that: include: Positioning component (1); A shielding component (2) is disposed in the middle of the outer wall surface of the positioning component (1); A sealing component (3) is disposed outside the positioning component (1) and is engaged with the shielding component (2); The positioning component (1) includes a positioning ring (11), and the outer wall surface of the positioning ring (11) and near the bottom position are provided with a plurality of stepped holes (12), and each stepped hole (12) is provided with a screw (13) in its inner cavity. The positioning ring (11) has an annular groove (14) at the upper part of the middle of its inner cavity, and a sealing ring (15) is provided in the inner cavity of the annular groove (14). The shielding component (2) includes a fixing ring (21) disposed in the middle of the outer wall surface of the positioning ring (11), a shield (22) is disposed at the upper position of the middle of the outer wall surface of the fixing ring (21), and a first retaining ring (24) is disposed on one side of the middle of the top surface of the shield (22), and the first retaining ring (24) is engaged and connected with the sealing component (3); The sealing assembly (3) includes a bottom ring (31), a vertical ring (33) is provided on the top surface of the bottom ring (31) and near the outer wall, a sealing ring (34) is fixedly provided on the top of the inner wall of the vertical ring (33), and the bottom end of the sealing ring (34) is engaged and connected with the inner cavity of the first retaining ring (24). The sealing assembly (3) also includes a diagonal brace (35), and multiple diagonal braces (35) are provided. The multiple diagonal braces (35) are arranged in a ring array on the inner wall of the vertical ring (33). The top of the diagonal brace (35) is connected to the bottom surface of the sealing ring (34). The bottom surface of the inner cavity of the shield (22) is fixedly provided with a insert ring (23), and the top surface of the bottom ring (31) and near the inner wall are fixedly provided with a second retaining ring (32), and the second retaining ring (32) is engaged with the insert ring (23); during operation, the positioning component 1 can be installed on the grinding disc and the shielding component 2 can be installed and fixed. Then, the sealing component 3 can be fixed on the top surface of the bottom shell and engaged with the shielding component 2.

Images